Lose or scratch your battery door? The Sony Ericsson z520a z525a Standard Battery Door is a great replacement battery door for the Sony Ericsson z520a z525a incase you have damaged or lost your battery door. The replacement battery door is manufactured by Sony Ericsson and is compatible with the Sony Ericsson z520a and z525a phone models. The battery door is made for the standard slim Lithium Ion Battery.